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Summit Racing® Transmission Crossmembers SUM-770308

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Crossmember, Transmission, Steel, Black, GM, 700R4, 200-4R, TH350, TH400, Powerglide, Each

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Brand: Summit Racing

Manufacturer's Part Number: SUM-770308

Part Type: Transmission Crossmembers

Product Line: Summit Racing® Transmission Crossmembers

Summit Racing Part Number: SUM-770308

Transmission Crossmember to Frame Bushing Included: No

Transmission Mount Included: No

Amount of Drop: None

Crossmember Material: Steel

Crossmember Finish: Black powdercoated

Quantity: Sold individually.

Notes: This crossmember will not fit convertibles or El Caminos due to their boxed frame rails, nor will it fit 1968-72 GTOs and LeMans applications with a rubber mounted crossmember. If you plan to install this crossmember on a 1972 Monte Carlo please measure the distance across the frame or crossmember bolt holes. If the distance is approximately 53.5 in. this is the correct crossmember. If the distance is approximately 51 in. SUM-770322 (TH350, TH400) or SUM-770323 (700R4, 4L60, 4L60E) crossmember will be required.

In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Our Summit Racing® steel transmission crossmembers allow you to run a true dual-exhaust system with most popular GM transmissions. They have a patented double-hump design, so you don't have to compromise ground clearance by running pipes under the crossmember, and they're a complete bolt-on deal--no custom fabricating or realignment is needed. They're made from 2 in. x 3 in. boxed tubing (1/8 in. thick) to handle the frame-twisting power of big blocks.

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Most Helpful Reviews Review this Product

8 Customer Reviews for Summit Racing SUM-770308 - Summit Racing® Transmission Crossmembers

Average Customer Review

5 Star

(4)

4 Star

(2)

3 Star

(0)

2 Star

(1)

1 Star

(1)
+See All 8 Reviews

Improve Exhaust Pipe Routing with 2 1/2 inch pipes

Summit RacingSummit Racing Verified Purchase

The factory original transmission crossmember presents real challenges to a header installation in an early A body. Significant work bending straight pipes is required for a good fit. This crossmember allowed direct fit of straight pipes between the headers and the muffler inlet with plenty of clearance. Additionally the larger frame mount bolts with more steel in the crossmember provide more strength in the critical location of the back of the transmission. My original crossmember was not rusted through, but I have seen a number of cases where rust had depleted the mount strength significantly. ...read more

2 of 2 found this review helpful.

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Reviewer: ELROY from KS

Date: March 05, 2014

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Installed on 69 Chevelle

Summit RacingSummit Racing Verified Purchase

I wasn't able to find a lot of reviews on this product before purchasing, but I figured it was a pretty straight-forward part. Overall, the piece looks nice, sturdy (heavy!) powdercoat was good etc.. However, when I went to install it, that's when the fun began. I knew I would have to drill out the frame 1/2" for the larger bolts, no big deal. The issue I ran into was the crossmember was just a little too narrow and the bolts wouldn't align. I ended up having to drill out part of the crossmember where it attaches to the frame and also where the transmission mount is, plus a decent hole opened up in the frame. Overall, I'm not very satisfied with the product for the price I would have expected it to fit a little better. I'm still not sure I feel 100% comfortable with how it's installed. ...read more

0 of 0 found this review helpful.

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Reviewer: TODD from MO

Date: January 11, 2015

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G Force x member-64-67 A body

Summit RacingSummit Racing Verified Purchase

Well made, heavy, but provides great ground clearance for large exhaust I didn't realize they made a X mem. for 64-67 with a turbo 400, but I made this one work

0 of 0 found this review helpful.

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Reviewer: JAMES from MD

Date: November 24, 2014

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Summit Racing Transmission Crossmember sum-770308

Summit RacingSummit Racing Verified Purchase

Nice heavy duty crossmember for my 1971 chevelle,The only reason I rated as good was because the mounting holes were 3/8" short so I had to elongate them to make it work.

0 of 0 found this review helpful.

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Reviewer: MICHAEL from MI

Date: November 01, 2014

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g force crossmember

Summit RacingSummit Racing Verified Purchase

Very well built sturdy unit. Installed without an issue. I used it to install a 200r4 trans in my 66 gto.

0 of 0 found this review helpful.

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Reviewer: HARVEY from Canada

Date: September 26, 2014

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Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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